ARPN (PLANTACYANIN); copper ion binding. Identical to Putative basic blue protein precursor [Arabidopsis Thaliana] (GB:Q8LG89;GB:O64499;GB:Q8S8T5); similar to plastocyanin-like domain-containing protein / mavicyanin, putative [Arabidopsis thaliana] (TAIR:AT5G26330.1); similar to unnamed protein product [Vitis vinifera] (GB:CAO24755.1); contains InterPro domain Cupredoxin (InterPro:IPR008972); contains InterPro domain Plastocyanin-like; (InterPro:IPR003245)